Aerial



AERIAL 27, 1924 2 Sheets-Sheetl J. E. MONTELIUS Filed Dec.

Feb. .8, 1927.

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1 1,617,023 1927? Y J. E. MQNTELIUS AERIAL Filed Dec. 27, 1924 2 Sheets-Sheet. 2-

Patented eh. 8, 1927 I JOHN E. MONTEIYIIUS, OF LOS ANGELES, CALIFORNIA.

AERIAL.

Application filed December 27, 1924. Serial No. 758,394.

This invention relates to an improved aerial and seeks, among other objects, to provide an aerial wherein the aerial conductor will be shielded from interfering waves as well as static.

The invention seeks, as a further object, to provide 1 an aerial wherein the aerial coil employed will be surrounded by a shielding cage grounded through asuitable variable resistance which may be adjusted to drain off the interfering or disturbing potential. j V

And the invention seeks, as a still further object, to provide an aerial embodyinga counterpoise and wherein the counterpoise may be adjusted relative to the aerial coil for varying'the capacity of the aerial.

Other and incidental'objects will appear hereinafter. 1 In the accompanying drawings: Figure 1 is a side elevation of my improved aerial.

Figure 2 is a sectional view on the line .22 of Figure 1, looking inthedirection indicated by the arrows.

Figure 3' is an enlarged detail sectional 7 view particularly cage.

Figure 4 is a transverse sectional view on the l' ne 44 of Figure 3, looking in the showing the aerial coil and direction of the arrows.

In carrying the invention. into effect, I employ a pair of supportsor masts 10 which are erected a suitable distance apart and are preferably of a considerable height. As shown in Figure 2, steel or iron tubing or pipe may be employed for the masts and thereof, is a lead 27 which is connected to the ground post of the receiving set. Fixed although I havenot so illustrated, appropriate guy wires may, of course, be employed for staying the masts. Atfthe upper ends of the masts are eye bolts 11 and stretched between said eye bolts is a shielding cage embodying a plurality of wires or conductors 12 connected at their ends to suitable insulators 13, and holding the wires apart throughout the major portion of their length are spreaders 1 1. The spreaders may be of any approved material and, as shown in Figure 4 of the drawings, are preferably circular,v

while the wires 12 are inserted through the spreaders at equi-distantly spaced points. In the present instance, I have shown the use of a four-wire cage but, of course, this detail may be varied. Connecting the insulators 13 with the eye'bolts 11 are-short lengths of wire or other suitable flexible elements 15 and leading from one end of the cage is "a conductor 16 connected to one terminalof an appropriate variable resistance 17. The conductor 16 is, of course, electrically connected with all of the wires of the cage. The resistance 17 is preferably located near the receiving set so as to be conveniently accessible, and leading from the other terminal of said resistance is a wire 18 which may be grounded'to one or both of the masts 10 or directly to the earth.

Centrally supported within the cage'is an aerial conductor 19 which is preferably in the nature of a coil, as shown, and the wire employed, is, resilient so that the'coiljmay be stretched to the desired length. At, its

ends the coil is, as'particularly shown in Figure 3, connected to insulators 20. and extend 'ing between said insulators and the insulators 13 are short lengthsof wire or othersuitable flexible 'elements21 for supporting the coilwithin the cage. Attached to the'end of the coil 19 opposite the location ofthe groundlead 16, is a lead-in 22 which extends to the receiving set. I

In conjunction with the aerial conductor and its shieldingcage, I providea counterpoise which includes a pair of spreaders 23 and suitably connected with the spreaders are insulators 24:- Oonnected at their ends to said insulators is a plurality of counterpoise wires 25 and electrically connecting saidwires at each end of the counterpoise are cross wires 26. Any approved number of counterpoise Wires may be employed and attached to one of said cross wires, preferably at a point midway between the ends to the spreaders 23 are yokes'28 aper-,, tured atjtheir endsto receive the spreaders therethrough. As shown 'in Figure 2, the

yokes are formed to freely straddle the masts 10 and, as brought out in Figure 1, the masts are formed with vertically spaced openings 29 to selectively receive pins 30 extending through the yokes and through the masts and thus varying the capacity of the aerial.

The lead-in 27 is connected tothe aerial post of the receiving set so that signals are received directly from the aerial conductor 19 and I have discovered that by employing a cage for the aerial conductor, as herein described, practically all interfering signal Waves are grounded by the cage through the wire 16, resistance 17, and wire 18, andare accordingly either materially lessened in strei'igth, as manifested in the circuit of the aerial conductor, or are eliminated altogether. The same has been found true in connection with static. I have "further discovered that by employing the variable resistance 17 in the cage circuit, a means is provided whereby, through the adjustment of said resistance, certain signals 'may be dissipated or eliminated to the exclusion of others. Accordingly, by changing the adjustment of the resistance 17 as 'the'receiv ing'set is tuned from one wave length to another, pure reception may be had substantially'free from interference or static.

An ordinary potential when used to provide the resistance 17, has been found ample to cover the wave length range of broadcast receiving sets as now on the market.

Having thus described the invention, what I cla'imisi 1.'An aerial including spaced masts, an

aer al conductor sustained thereby, a counter-poise supported by the masts'to extend therebetween beneath the aerial conductor, means for adjusting'the counterpoise-vertically ofthe masts to vary the capacity of the aerial, and means to coact between said first mentioned means and the mast for locking saidffirst mentioned means in adjusted position.

2. An' aerial including spaced masts, an electrically grounded cage anchored at its ends thereto, an aerial conductor supported to extend longitudinally within the cage and shielded thereby, a variable resistance interposed in the ground lead of the cage, a counterpoise supported by the masts to extend therebetween beneath the aerial conductor, means for adjusting the counterpoise vertically of the masts to vary the capacity of straddling the masts, spreaders carried by the,

kes, wires insulatingly'supportedby said spreaders to form a'counterpoise extending between the masts beneath the aerial con- 'ductor, the yokes being 'shiftable" along the masts for elevating or lowering the counterpoise' to vary the capacity of the aerial, and means to coact betweenthe yok'es and masts for securing theyokes in adjusted position.

4. An aerial including a mast, an aerial conductor anchored thereto, a counterpoise, means connecting the counterpoisejwith the mast whereby said counterp oise may be adjusted vertically to vary the capacity of the aerial, and means for locking said first mentioned means in adjusted position, the mast being provided at spaced points with means to selectively accommodate said locking 7 means.

5. An aerial including a mast, an aerial conductor anchored thereto, a counterpoise, means connecting the counterpoise with the mast whereby said counterp oi'semay be adjusted vertically to vary the capacity of the aerial, and means engageable through the mast for locking said first mentionedmeans in adjusted position.

6. An aerial including a mast, an aerial conductor anchored thereto, a yoke strad dling the mast, a spread-er carried by said yoke, a conductorinsulatingly supported by said spreader to form a counterpoise extending beneath said aerial conductor, said yoke being shiftable along the mast for elevating or lowering the counterpoise to vary the capacity of the aerial, and: means, to coact between the yoke and mast tor securing the yoke in adjusted position. i

. In testimony whereof I affix my signature.

Jonas. MoNTELms- [1,. s1 

